I test a cm180R v1 Designed for 180ah lifepo4 cells
It is supposed to be able to bleed up to 1000mah and start bleeding current at 3.600v. It's also supposed to trigger the one wire loop at 4.000v high voltage and 2.600v low voltage. It's listed as consuming 2.00ma at nominal voltage.
First test is to see what the cell board consumes at 3.2000v. Turns out they consume 2.02ma, spot on what the specs list
They don't start shunting any current befor 3.6000v and current starts to bleed bang on 3.600v. Though it ramps up very slowly. By 3.6100v it has only risen to 9ma and 2ma of that is idle consumption. 7ma of bleed
at 3.6300 we are only at 100ma and then it continues on adding roughly 50ma every 0.01v increase.Though its not completely linear.
So by 3.6500 we are only bleeding 200mah. By 3.7000v we have 450mah. 3.7500v we have 650ma bleed. At 3.800v 700ma. 3.8500v 730ma.
By 4.000v we have 800mah and at this stage the one wire loop should trigger for HVD. It didn't trigger at this point.
The one wire loop triggered HVD at 4.0764v and was bleeding 838ma at that stage.
So as you can see it is impossible for the board to bleed 1000ma as HVD is triggered befor you got there at 838ma bleed at 4.0764v
I would say most people wouldn't want to see higher than 3.7000V on a cell when balancing and even at that point your only bleeding around 400ma 40% of what the board is listed to be able to bleed.
Conclusion the current bleed voltage set point needs to be set way lower and we need to see the max advertised bleed current come on stronger faster. HVD is way to high for my liking though I guess as a emergency stop it's ok. I didn't see it bleed anything befor 3.6000v just its 2ma idle load so that's good. Though stage two of the test is to test LVD set point and then test consistency across all 16 cell boards.
Offgrid 2008, Selectronic PS1 6kw/48v inverter, x 2 Midnite solar classic 150 MPPT, 3960w NE PV 24 x 165w BP panels, 4200w NW PV 21 x 200w DAQO PV, 16x400ah lithium.